Understanding Neutron Radiography Reading VII-NRHB Part 2 of 2

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4.1 INTRODUCTION The assessment of neutron radiographs of nuclear fuel pins can be done much easier, faster and simpler if reference can be made to typical defects, which can be revealed by neutron radiography. In the fields of industrial 7- adiography such collections of reference radiographs, showing typical defects in welding, or casting have been compiled and published some time ago. Since the early 1970's neutron radiography is routinely used for the quality and performance control of nuclear fuel. During the assessment of neutron radiographs, some typical defects of the fuel were found and it was felt that a classification of such defects would help to speed up the assessment procedure. Therefore, in the frame of the programme of the Neutron Radiography Working Group, an atlas of reference neutron radiographs has been compiled [Ref. 1], which was printed as a working document on behalf of JRC Petten in June 1979. Charlie Chong/ Fion Zhang
It contains a collection of typical defects revealed by neutron radiography in light water reactor fuel, which are reproduced on X- ay film (original size) and as enlargements (2x) on photographic paper. A revised version of the atlas, which is supplemented with further examples of typical defects is under preparation and will be edited by the Neutron Radiography Working Group. It was not possible to reproduce in the handbook all the neutron radiographs contained in the atlas. Therefore a selection was made of those enlargements which illustrate the most characteristic defects occurring in light water reactor fuel. Charlie Chong/ Fion Zhang
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Understanding Neutron Radiography R
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The Magical Book of Neutron Radiogr
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ASNT Certification Guide NDT Level
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4. Interpretation/Evaluation • Im
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Fion Zhang at Shanghai 21th July 20
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Charlie Chong/ Fion Zhang http://gr
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Quantum Mechanics Part 3 of 4 - The
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Neutron Radiography ■ https://www
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2. RECOMMENDED PRACTICE FOR THE NEU
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2.1 APPLICABLE DOCUMENTS a) Neutron
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2.3 EQUIPMENT 2.3.1 General 2.3.1.1
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Charlie Chong/ Fion Zhang
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2.3.3.2 For the neutron radiography
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Discussion Subject 1: 2.3.3.2 For t
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2.4 RADIOGRAPHIC TECHNIQUES 2.4.1 G
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2.4.2.3 When using overlapping radi
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Table 1.4 The Characteristics of So
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Image Converters ■ ■ ■ Indire
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2.4.4 Image Recorders 2.4.4.1 As th
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2.4.5 Cassettes 2.4.5.1 The cassett
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2.4.7 Geometry 2.4.7.1 The manner i
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2.4.8 Density of the Radiograph 2.4
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2.4.10 Image Quality Indicators (IQ
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2.4.11.2 This should record the fol
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2.4.12.3 When track etch materials
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2.5 MEASUREMENT 2.5.1 Definition an
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Fuel Pins Charlie Chong/ Fion Zhang
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2.5.3 The Neutron Radiographic Tech
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2.5.5 Making the Measurements 2.5.5
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Table 1.4 The Characteristics of So
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2.5.5.7 Image recorders to be used
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2.5.5.10 Cassettes of the vacuum ty
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2.5.6 Image Enhancement 2.5.6.1 Ele
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2.7 FILM HANDLING 2.7.1 Storage of
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2.8 FILM PROCESSING 2.8.1 General T
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2.8.3.4 Development Normal developm
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2.8.3.8 Fixer Neutralising (?) The
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2.8.3.14 Drying Drying is a functio
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Manual Processing ■ https://www.y
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2.10 REFERENCE RADIOGRAPHS Part 4 o
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Page 89 and 90: 3. NRWG INDICATORS FOR TESTING OF B
Page 91 and 92: Those indicators, fabricated at Ris
Page 93 and 94: Fig. 3.1 The ASTM Beam Purity Indic
Page 95 and 96: Picture and drawing of Beam Purity
Page 97 and 98: Charlie Chong/ Fion Zhang Standard
Page 99 and 100: DL Film densities measured through
Page 101 and 102: BPI Radiograph Charlie Chong/ Fion
Page 103 and 104: The body of the BPI is made of a 8
Page 105 and 106: The body of the BPI-F consists of a
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Page 109 and 110: 3.1.3 Sensitivity Indicator (SI) In
Page 111 and 112: The calibration fuel pin CFP-E1 (Fi
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Page 115 and 116: Charlie Chong/ Fion Zhang BPI & AST
Page 117 and 118: Correct placement of Indicators in
Page 119 and 120: 3.2 ASSESSMENT OF TEST RESULTS FOR
Page 121 and 122: From those values the neutron expos
Page 123 and 124: From those values the neutron expos
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Page 131 and 132: From those values, exposure contrib
Page 133 and 134: 3.2.4 Assessment for the Calibratio
Page 135 and 136: Radial dimensions • Pellet diamet
Page 137: 4. ATLAS (COMPACT VERSION) OF DEFEC
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Page 143 and 144: Fig. 4.1 Components of a typical nu
Page 145 and 146: 4.2.3 Defect Location On Fig. 4.2 t
Page 147 and 148: 4.2.4 Defect Nature and Origin Defe
Page 149 and 150: 4.2.8 Measuring of Dimensions Besid
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Page 153 and 154: Insert Page 137~149 Charlie Chong/
Page 155 and 156: 124 A.a.5 Corner chips A.a.6 Other
Page 157 and 158: 126 A.b Defects in pellet-to-pellet
Page 159 and 160: 128 A.d Central void Central void c
Page 161 and 162: 130 B.a Hydrides in cladding Hydrid
Page 163 and 164: 132 C.b Defects of spring sleeve Fi
Page 165 and 166: 134 D. Defects in end plugs Fig. 4.
Page 167 and 168: Defects not shown in the present Co
Page 169 and 170: Table 5.1 Neutron Radiography Insta
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Page 173 and 174: Table 5.2 Contd. I S1te Facility Co
Page 175 and 176: Table 5.3 Site Contd. Facility Karl
Page 177 and 178: 145 -y, n SHIELDING a. SHIELDING AS
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DIDO REACTOR SHELL WALL REACTOR SHI
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5 8 020 --r REACTOR RE _liUL CO 12
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161 e CHANNEL WllH FUEL f)·r-: ;.t
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t POOL WATER J I I .. ·l i I FLANG
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165 OBJECT TA BLE TOP-SHIELDING REA
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-- - 1 Removable precollimation 2 I
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169 _-, . II II I I ___ r-----J 1 .
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Nuclear fuel pellets made of proces
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Peach - 我爱桃子 Charlie Cho
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Good Luck Charlie Chong/ Fion Zhang
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Understanding Neutron Radiography Reading VII-NRHB Part 2 of 2

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